__vet_atags

参考：atags--__vet_atags标签

　　    arch/arm/include/asm/setup.h

 /*
  *  linux/include/asm/setup.h
  *
  *  Copyright (C) 1997-1999 Russell King
  *
  * This program is free software; you can redistribute it and/or modify
  * it under the terms of the GNU General Public License version 2 as
  * published by the Free Software Foundation.
  *
  *  Structure passed to kernel to tell it about the
  *  hardware it's running on.  See Documentation/arm/Setup
  *  for more info.
  */
 #ifndef __ASMARM_SETUP_H
 #define __ASMARM_SETUP_H

 #include <linux/types.h>

 #define COMMAND_LINE_SIZE 1024

 /* The list ends with an ATAG_NONE node. */
 #define ATAG_NONE    0x00000000

 struct tag_header {
     __u32 size;
     __u32 tag;
 };

 /* The list must start with an ATAG_CORE node */
 #define ATAG_CORE    0x54410001

 struct tag_core {
     __u32 flags;        /* bit 0 = read-only */
     __u32 pagesize;
     __u32 rootdev;
 };

 /* it is allowed to have multiple ATAG_MEM nodes */
 #define ATAG_MEM    0x54410002

 struct tag_mem32 {
     __u32    size;
     __u32    start;    /* physical start address */
 };

 /* VGA text type displays */
 #define ATAG_VIDEOTEXT    0x54410003

 struct tag_videotext {
     __u8        x;
     __u8        y;
     __u16        video_page;
     __u8        video_mode;
     __u8        video_cols;
     __u16        video_ega_bx;
     __u8        video_lines;
     __u8        video_isvga;
     __u16        video_points;
 };

 /* describes how the ramdisk will be used in kernel */
 #define ATAG_RAMDISK    0x54410004

 struct tag_ramdisk {
     __u32 flags;    /* bit 0 = load, bit 1 = prompt */
     __u32 size;    /* decompressed ramdisk size in _kilo_ bytes */
     __u32 start;    /* starting block of floppy-based RAM disk image */
 };

 /* describes where the compressed ramdisk image lives (virtual address) */
 /*
  * this one accidentally used virtual addresses - as such,
  * it's deprecated.
  */
 #define ATAG_INITRD    0x54410005

 /* describes where the compressed ramdisk image lives (physical address) */
 #define ATAG_INITRD2    0x54420005

 struct tag_initrd {
     __u32 start;    /* physical start address */
     __u32 size;    /* size of compressed ramdisk image in bytes */
 };

 /* board serial number. "64 bits should be enough for everybody" */
 #define ATAG_SERIAL    0x54410006

 struct tag_serialnr {
     __u32 low;
     __u32 high;
 };

 /* board revision */
 #define ATAG_REVISION    0x54410007

 struct tag_revision {
     __u32 rev;
 };

 /* initial values for vesafb-type framebuffers. see struct screen_info
  * in include/linux/tty.h
  */
 #define ATAG_VIDEOLFB    0x54410008

 struct tag_videolfb {
     __u16        lfb_width;
     __u16        lfb_height;
     __u16        lfb_depth;
     __u16        lfb_linelength;
     __u32        lfb_base;
     __u32        lfb_size;
     __u8        red_size;
     __u8        red_pos;
     __u8        green_size;
     __u8        green_pos;
     __u8        blue_size;
     __u8        blue_pos;
     __u8        rsvd_size;
     __u8        rsvd_pos;
 };

 /* command line: \0 terminated string */
 #define ATAG_CMDLINE    0x54410009

 struct tag_cmdline {
     char    cmdline[];    /* this is the minimum size */
 };

 /* acorn RiscPC specific information */
 #define ATAG_ACORN    0x41000101

 struct tag_acorn {
     __u32 memc_control_reg;
     __u32 vram_pages;
     __u8 sounddefault;
     __u8 adfsdrives;
 };

 /* footbridge memory clock, see arch/arm/mach-footbridge/arch.c */
 #define ATAG_MEMCLK    0x41000402

 struct tag_memclk {
     __u32 fmemclk;
 };

 struct tag {
     struct tag_header hdr;
     union {
         struct tag_core        core;
         struct tag_mem32    mem;
         struct tag_videotext    videotext;
         struct tag_ramdisk    ramdisk;
         struct tag_initrd    initrd;
         struct tag_serialnr    serialnr;
         struct tag_revision    revision;
         struct tag_videolfb    videolfb;
         struct tag_cmdline    cmdline;

         /*
          * Acorn specific
          */
         struct tag_acorn    acorn;

         /*
          * DC21285 specific
          */
         struct tag_memclk    memclk;
     } u;
 };

 struct tagtable {
     __u32 tag;
     int (*parse)(const struct tag *);
 };

 #define tag_member_present(tag,member)                \
     ((unsigned long)(&((struct tag *)0L)->member + )    \
         <= (tag)->hdr.size * )

 #define tag_next(t)    ((struct tag *)((__u32 *)(t) + (t)->hdr.size))
 #define tag_size(type)    ((sizeof(struct tag_header) + sizeof(struct type)) >> 2)

 #define for_each_tag(t,base)        \
     for (t = base; t->hdr.size; t = tag_next(t))

 #ifdef __KERNEL__

 #define __tag __used __attribute__((__section__(".taglist.init")))
 #define __tagtable(tag, fn) \
 static struct tagtable __tagtable_##fn __tag = { tag, fn }

 /*
  * Memory map description
  */
 #ifdef CONFIG_ARCH_LH7A40X
 # define NR_BANKS
 #else
 # define NR_BANKS
 #endif

 struct membank {
     unsigned long start;
     unsigned long size;
     int           node;
 };

 struct meminfo {
     int nr_banks;
     struct membank bank[NR_BANKS];
 };

 extern struct meminfo meminfo;

 #define for_each_nodebank(iter,mi,no)            \
     for (iter = ; iter < (mi)->nr_banks; iter++)    \
         if ((mi)->bank[iter].node == no)

 #define bank_pfn_start(bank)    __phys_to_pfn((bank)->start)
 #define bank_pfn_end(bank)    __phys_to_pfn((bank)->start + (bank)->size)
 #define bank_pfn_size(bank)    ((bank)->size >> PAGE_SHIFT)
 #define bank_phys_start(bank)    (bank)->start
 #define bank_phys_end(bank)    ((bank)->start + (bank)->size)
 #define bank_phys_size(bank)    (bank)->size

 /*
  * Early command line parameters.
  */
 struct early_params {
     const char *arg;
     void (*fn)(char **p);
 };

 #define __early_param(name,fn)                    \
 static struct early_params __early_##fn __used            \
 __attribute__((__section__(".early_param.init"))) = { name, fn }

 #endif  /*  __KERNEL__  */

 #endif

setup.h